
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkPaint.h"

// ensure that we don't accidentally screw up the bounds when the oval is
// fractional, and the impl computes the center and radii, and uses them to
// reconstruct the edges of the circle.
// see bug# 1504910
static void test_circlebounds(SkCanvas* canvas)
    {
#ifdef SK_SCALAR_IS_FLOAT
    SkRect r = { 1.39999998f, 1, 21.3999996f, 21 };
    SkPath p;
    p.addOval(r);
    SkASSERT(r == p.getBounds());
#endif
    }

class CircleView : public SampleView
    {
    public:
        static const SkScalar ANIM_DX;
        static const SkScalar ANIM_DY;
        static const SkScalar ANIM_RAD;
        SkScalar fDX, fDY, fRAD;

        CircleView()
            {
            fDX = fDY = fRAD = 0;
            fN = 3;
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "Circles");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        void circle(SkCanvas* canvas, int width, bool aa)
            {
            SkPaint paint;

            paint.setAntiAlias(aa);
            if (width < 0)
                {
                paint.setStyle(SkPaint::kFill_Style);
                }
            else
                {
                paint.setStyle(SkPaint::kStroke_Style);
                paint.setStrokeWidth(SkIntToScalar(width));
                }
            canvas->drawCircle(0, 0, SkIntToScalar(9) + fRAD, paint);
            }

        void drawSix(SkCanvas* canvas, SkScalar dx, SkScalar dy)
            {
            for (int width = -1; width <= 1; width++)
                {
                canvas->save();
                circle(canvas, width, false);
                canvas->translate(0, dy);
                circle(canvas, width, true);
                canvas->restore();
                canvas->translate(dx, 0);
                }
            }

        static void blowup(SkCanvas* canvas, const SkIRect& src, const SkRect& dst)
            {
            SkDevice* device = canvas->getDevice();
            const SkBitmap& bm = device->accessBitmap(false);
            canvas->drawBitmapRect(bm, &src, dst, NULL);
            }

        static void make_poly(SkPath* path, int n)
            {
            if (n <= 0)
                {
                return;
                }
            path->incReserve(n + 1);
            path->moveTo(SK_Scalar1, 0);
            SkScalar step = SK_ScalarPI * 2 / n;
            SkScalar angle = 0;
            for (int i = 1; i < n; i++)
                {
                angle += step;
                SkScalar c, s = SkScalarSinCos(angle, &c);
                path->lineTo(c, s);
                }
            path->close();
            }

        static void rotate(SkCanvas* canvas, SkScalar angle, SkScalar px, SkScalar py)
            {
            canvas->translate(-px, -py);
            canvas->rotate(angle);
            canvas->translate(px, py);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            SkPaint paint;
            paint.setAntiAlias(true);
            paint.setStyle(SkPaint::kStroke_Style);
//        canvas->drawCircle(250, 250, 220, paint);
            SkMatrix matrix;
            matrix.setScale(SkIntToScalar(100), SkIntToScalar(100));
            matrix.postTranslate(SkIntToScalar(200), SkIntToScalar(200));
            canvas->concat(matrix);
            for (int n = 3; n < 20; n++)
                {
                SkPath path;
                make_poly(&path, n);
                SkAutoCanvasRestore acr(canvas, true);
                canvas->rotate(SkIntToScalar(10) * (n - 3));
                canvas->translate(-SK_Scalar1, 0);
                canvas->drawPath(path, paint);
                }
            }

    private:
        int fN;
        typedef SampleView INHERITED;
    };

const SkScalar CircleView::ANIM_DX(SK_Scalar1 / 67);
const SkScalar CircleView::ANIM_DY(SK_Scalar1 / 29);
const SkScalar CircleView::ANIM_RAD(SK_Scalar1 / 19);

//////////////////////////////////////////////////////////////////////////////
#if 0
static SkView* MyFactory()
    {
    return new CircleView;
    }
static SkViewRegister reg(MyFactory);
#endif
